Fix USB Mouse/Joystick HID report ID

Fixes #1410

The USB Keyboard now has 2 reports (keyboard + consumer control), so when both
Keyboard and Mouse libraries are included, the Mouse must be report 3, not 2.

Update the Mouse and Joystick report IDs appropriately.

Author: earlephilhower

cores/rp2040/RP2040USB.cpp

@@ -130,13 +130,13 @@ int __USBGetKeyboardReportID() {
 }
 
 int __USBGetMouseReportID() {
-    return __USBInstallKeyboard ? 2 : 1;
+    return __USBInstallKeyboard ? 3 : 1;
 }
 
 int __USBGetJoystickReportID() {
     int i = 1;
     if (__USBInstallKeyboard) {
-        i++;
+        i += 2
     }
     if (__USBInstallMouse || __USBInstallAbsoluteMouse) {
         i++;